1158. Найдите значение выражения: a) -2,4/-0,8; в) 1,4/-4,2; д) 5,4 (-1,7)/-5,1.0,6; ж)-0,75 : 1; 8 17 и) 6;-1 2/15 4 5 б) -7,6/3,8; г) -1,3/6,5; е) 0,72 : (-8/9); з) -2,8:4; 2 3 к) -1; 1/2/6

а) \[\frac{-2,4}{-0,8} = \frac{2,4}{0,8} = 3\]

б) \[\frac{-7,6}{3,8} = -2\]

в) \[\frac{1,4}{-4,2} = -\frac{1,4}{4,2} = -\frac{1}{3}\]

г) \[\frac{-1,3}{6,5} = -\frac{1,3}{6,5} = -\frac{1}{5} = -0,2\]

д) \[\frac{5,4 \cdot (-1,7)}{-5,1 \cdot 0,6} = \frac{-9,18}{-3,06} = \frac{9,18}{3,06} = 3\]

е) \[0,72 : \left(-\frac{8}{9}\right) = \frac{72}{100} : \left(-\frac{8}{9}\right) = \frac{18}{25} \cdot \left(-\frac{9}{8}\right) = -\frac{18 \cdot 9}{25 \cdot 8} = -\frac{9 \cdot 9}{25 \cdot 4} = -\frac{81}{100} = -0,81\]

ж) \[-0,75 : 1\frac{8}{17} = -\frac{3}{4} : \frac{25}{17} = -\frac{3}{4} \cdot \frac{17}{25} = -\frac{51}{100} = -0,51\]

з) \[-2,8 : 4\frac{2}{3} = -2,8 : \frac{14}{3} = -\frac{28}{10} \cdot \frac{3}{14} = -\frac{2 \cdot 3}{10} = -\frac{6}{10} = -0,6\]

и) \[6\frac{4}{5} : \left(-1\frac{2}{15}\right) = \frac{34}{5} : \left(-\frac{17}{15}\right) = \frac{34}{5} \cdot \left(-\frac{15}{17}\right) = -\frac{2 \cdot 3}{1} = -6\]

к) \[-1\frac{1}{3} : 2\frac{1}{6} = -\frac{4}{3} : \frac{13}{6} = -\frac{4}{3} \cdot \frac{6}{13} = -\frac{4 \cdot 2}{13} = -\frac{8}{13}\]